Re: [Elecraft] 48 volt PS

2017-12-11 Thread Dave B via Elecraft 
Ted.

Best to box the PSU and silence the fan with sound deadening material
without affecting airflow.  In effect, creating a "silencer" for the air
inlet, and maybe outlet.

For that sort of power level 500W and above, and the small size of those
PSU's, the cooling is critical for a long life.  So, the gutsy but noisy
fan is there for a reason.   Replace it with a quieter one if you must,
but don't compromise the airflow.

As to RFI.  All SMPS's create it, some more than others, by design.  It
can be filtered of course, but to do that properly will also cost a fair
bit.

Voltage divider?  Just use a dedicated 12 (13.8V) PSU for the K3.  You
then have redundancy for when the 48V supply quits at some point.   If
you must, one of the common "Telecom" DC/DC converters, (48 to 15V, and
a linear post reg) to get your K3 supply.

But, make sure you know which side of any such DC/DC converter is
common, if not isolated.  You may be (unpleasantly) surprised!

Remember the KISS principle.

73  Dave G0WBX.


On 09/12/17 19:47, elecraft-requ...@mailman.qth.net wrote:
> I need to buy a 48 VDC power supply for a project that requires that voltage 
> ? and possibly along with a voltage divider to power the K3.  One suggestion 
> I?ve received is the MeanWell SE 600-48.  The online reviews are good, noting 
> only high fan noise, which can be fixed by replacing the fan with a Vantac 
> Stealth.  But I haven?t seen anything about RFI.
>
> Anyone know this PS who could say something about the RFI question?  Anyone 
> have other suggestions for 48 VDC and at least 12 amps?
>
> Thanks, as always,
>
> Ted, KN1CBR

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Re: [Elecraft] 48 volt PS

2017-12-07 Thread Bob via Elecraft 

Hi Ed,

  As a reference point. Elecraft uses a MeanWell RSP-3000-48 in the KPA1500 
power supply as shown on the FCC site.


  Does not show any extra filtering added. Terminals to rear panel 
connector directly.   That is an endorsement of at least that model in my opinion.


73,
Bob
K2TK ex KN2TKR (1956) & K2TKR



On 12/7/2017 12:57 PM, Dauer, Edward wrote:

I need to buy a 48 VDC power supply for a project that requires that voltage – 
and possibly along with a voltage divider to power the K3.  One suggestion I’ve 
received is the MeanWell SE 600-48.  The online reviews are good, noting only 
high fan noise, which can be fixed by replacing the fan with a Vantac Stealth.  
But I haven’t seen anything about RFI.

Anyone know this PS who could say something about the RFI question?  Anyone 
have other suggestions for 48 VDC and at least 12 amps?

Thanks, as always,

Ted, KN1CBR



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Re: [Elecraft] 48 volt PS

2017-12-07 Thread Russ 
Correction - it’s a 24VDC Meanwell - sorry.  Still works OK

Russ KD4JO

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of kg9hfr...@gmail.com
Sent: Thursday, December 7, 2017 1:21 PM
To: John Stengrevics <jstengrev...@comcast.net>
Cc: Dauer, Edward <eda...@law.du.edu>; elecraft@mailman.qth.net
Subject: Re: [Elecraft] 48 volt PS

Curious, I have a Meanwell  RSP-3000-12
Anyone repair them?  Frank KG9H
 
> On Dec 7, 2017, at 12:13 PM, John Stengrevics <jstengrev...@comcast.net> 
> wrote:
> 
> I use a Meanwell power supply for my amp.  It causes very little RFI on my 
> K3S which is readily suppressed with ferrites.
> 
> John
> WA1EAZ
> 
>> On Dec 7, 2017, at 12:57 PM, Dauer, Edward <eda...@law.du.edu> wrote:
>> 
>> I need to buy a 48 VDC power supply for a project that requires that voltage 
>> – and possibly along with a voltage divider to power the K3.  One suggestion 
>> I’ve received is the MeanWell SE 600-48.  The online reviews are good, 
>> noting only high fan noise, which can be fixed by replacing the fan with a 
>> Vantac Stealth.  But I haven’t seen anything about RFI.
>> 
>> Anyone know this PS who could say something about the RFI question?  Anyone 
>> have other suggestions for 48 VDC and at least 12 amps?
>> 
>> Thanks, as always,
>> 
>> Ted, KN1CBR
>> 
>> __
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Re: [Elecraft] 48 volt PS

2017-12-07 Thread kg9hfr...@gmail.com 
Curious, I have a Meanwell  RSP-3000-12
Anyone repair them?  Frank KG9H
 
> On Dec 7, 2017, at 12:13 PM, John Stengrevics  
> wrote:
> 
> I use a Meanwell power supply for my amp.  It causes very little RFI on my 
> K3S which is readily suppressed with ferrites.
> 
> John
> WA1EAZ
> 
>> On Dec 7, 2017, at 12:57 PM, Dauer, Edward  wrote:
>> 
>> I need to buy a 48 VDC power supply for a project that requires that voltage 
>> – and possibly along with a voltage divider to power the K3.  One suggestion 
>> I’ve received is the MeanWell SE 600-48.  The online reviews are good, 
>> noting only high fan noise, which can be fixed by replacing the fan with a 
>> Vantac Stealth.  But I haven’t seen anything about RFI.
>> 
>> Anyone know this PS who could say something about the RFI question?  Anyone 
>> have other suggestions for 48 VDC and at least 12 amps?
>> 
>> Thanks, as always,
>> 
>> Ted, KN1CBR
>> 
>> __
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>> Message delivered to jstengrev...@comcast.net
> 
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Re: [Elecraft] 48 volt PS

2017-12-07 Thread John Stengrevics 
Feel free Ted,

John
WA1EAZ

> On Dec 7, 2017, at 1:13 PM, John Stengrevics  wrote:
> 
> I use a Meanwell power supply for my amp.  It causes very little RFI on my 
> K3S which is readily suppressed with ferrites.
> 
> John
> WA1EAZ
> 
>> On Dec 7, 2017, at 12:57 PM, Dauer, Edward  wrote:
>> 
>> I need to buy a 48 VDC power supply for a project that requires that voltage 
>> – and possibly along with a voltage divider to power the K3.  One suggestion 
>> I’ve received is the MeanWell SE 600-48.  The online reviews are good, 
>> noting only high fan noise, which can be fixed by replacing the fan with a 
>> Vantac Stealth.  But I haven’t seen anything about RFI.
>> 
>> Anyone know this PS who could say something about the RFI question?  Anyone 
>> have other suggestions for 48 VDC and at least 12 amps?
>> 
>> Thanks, as always,
>> 
>> Ted, KN1CBR
>> 
>> __
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>> Message delivered to jstengrev...@comcast.net
> 
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Re: [Elecraft] 48 volt PS

2017-12-07 Thread John Stengrevics 
I use a Meanwell power supply for my amp.  It causes very little RFI on my K3S 
which is readily suppressed with ferrites.

John
WA1EAZ

> On Dec 7, 2017, at 12:57 PM, Dauer, Edward  wrote:
> 
> I need to buy a 48 VDC power supply for a project that requires that voltage 
> – and possibly along with a voltage divider to power the K3.  One suggestion 
> I’ve received is the MeanWell SE 600-48.  The online reviews are good, noting 
> only high fan noise, which can be fixed by replacing the fan with a Vantac 
> Stealth.  But I haven’t seen anything about RFI.
> 
> Anyone know this PS who could say something about the RFI question?  Anyone 
> have other suggestions for 48 VDC and at least 12 amps?
> 
> Thanks, as always,
> 
> Ted, KN1CBR
> 
> __
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